Lamp-fixture insulating-base.



.L. ERIKSON. LAMP FIXTURE INSULATING BASE.

APPLICATION TILED AUGx 18, 1911.

Patented Nov. 12,1912.

LEONARD EBIKSON, OF MALDEN, MASSACHUSETTS.

LAMP-FIXTURE INSULATING-BASE.

Specification of Letters Patent.

PatentedNov. 12, 1912.

Application filed August 18, 1911. Serial No. 644,792.

To all whom it may concern:

Be it known that I, LEONARD ERIKSON citizen of the United States, and resident of Malden, in the county of Middlesex and 5 State of Massachusetts, have invented a new and useful Improvement in Lamp-Fixture Insulating-Bases, of which the following is a specification.

M invention relates to insulating bases for amp fixtures, and its object is to improve the same in the manner hereinafter set forth.

The drawings which accompany and form a part of this specification illustrate one embodiment of my invention.

In the drawings, Fi re 1 is a central section on my improve lamp fixture insulating base, Fig. 2 is an elevation of the same, and Fig. 3 is a plan view with the canopy removed.

In the particular drawings selected for illustrating my invention, 1 represents the usual outlet box, which is secured to the wall or ceiling of the building in any suitable manner, and which in the present case is provided with a central threaded stud 2, shown in the present example of my invention as fastened to the outlet box by the screws 2'. The outlet box is also provided with inwardly projecting lugs 3, 3, provided with threaded holes. 5

4 is an insulating base which may be secured to the outlet box in twoways. The insulating base is provided with a central 0 ning.9 countersunk as shown at 10, and

tilt threaded ca 6, provided with the. flange 7, passes throug said orifice and screws onto the stud, thereby clamping the insulating base to the outlet box. The washer 8 may be interposed between the flange 7 and the countersunk portion of the opening-9. I

The insulating base is provided also with the oppositely arranged openings 11, 11, each countersunk as shown at 12, and the screws 13 passing through the o nings 11 take into the threaded holes in e lugs 3 of the outlet box, and so clamp the base to thebox,

washer 13. being intert'posed between the heads of the screws and e countersunk portion of the openings.

Inasmuch as some of the outlet boxes in common, use are not provided with lugs'like 1' those shown at 3, the utility of the construction above described,- whereby two means are provided for securing the insulating base to the box, will readily be appreciated.

A crow-foot support 14:, terminating in the. outlet pipe 14, is secured to the front face of the insulating base by means of the screws 14", which ass through slots in the feet of the crowoot support, and if desired a sheet of fiber or other suitable insulating material may -be interposed between the crow-foot support and the insulating base.

The canopy 19 is placed over the insulating base as shown, and thethreaded hook 16,

which terminates in the interiorly and ex-.

teriorly threaded socket 17, is screwed on the end of the threaded pipe 14, which projects beyond the canopy, and the latter is clamped in position by the lock nut 18. By unscrewing the lock nut 18, the canopy may be partially withdrawn from the base without otherwise dismantling the apparatus, for the purpose of affording ready access to the interior. The conductors 20 pass throu h a hole 21 in the outlet box and up into t e canopy, and are there connected, as shown at 23, to the conductors 22 which lead to the lamp socket. The lamp socket or electrolier is arranged to be suspended on the hook 16 in a manner well understood. I

I claim: 7

1. In a device of the character described, an outlet 'box, a threaded central stud secured thereto, an insulating base provided with a central countersunk opening, a socket v 8 device of the character described,

an arranged to clamp said canopy to said base.

In testimony whereof, I have hereunto aotian) ERIKSON. Witnesses: I it Pa'mrox J. Connor,

Gno. K. Woonwonm.

subscribed my name this 16 day of Aug. 

